Twisted Multi Channel Angular Pressing (TMCAP) as a Novel Severe Plastic Deformation Method

Abstract

The Twist Multi Channel Angular Pressing (TMCAP) process is presented for the first time to investigate the mechanical properties of AL1050 numerically and experimentally. TMCAP that can be categorized as a SPD method is a process based on combining the Equal Channel Angular Pressing and Twist Extrusion processes. The process was simulated entirely using dynamic explicit solution of ABAQUS/software. Based on the simulation results as well as considering the hydrostatic pressure effect on die filling and strain distribution, the TMCAP die was designed in which the horizontal channel creates a required hydrostatic pressure during the process. This process can effectively impose large strains to a bulk material to enhance the mechanical properties. Upon on a single pass of routes, a value of nearly 2.4 total strain was obtained without having significant changes in the billet cross section. In addition, the load obtained from simulation of TMCAP process at the first pass was about 22 tons which has a good conformity with the value obtained from experimental study. The process was also repeated up to four passes to evaluate the subsequent mechanical properties such as the flow stress and the Vickers micro-hardness as well as microstructure after each pass.